Huh, I am unaware of this. Feel free to ping us on Intercom about any old posts you want deleted. The old database was somewhat inconsistent about the ways it marked posts as deleted, so there is a chance we missed some.
Yeah MoneyForHealth, it does seem like it would be useful if you can point out instances of this happening on LW. Then we’ll have a better shot at figuring out how it happened, and avoiding it happening with the EA Forum migration.